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Research ArticleArticle

Effects of Pirfenidone on Transforming Growth Factor-β Gene Expression at the Transcriptional Level in Bleomycin Hamster Model of Lung Fibrosis

S. N. Iyer, G. Gurujeyalakshmi and S. N. Giri
Journal of Pharmacology and Experimental Therapeutics October 1999, 291 (1) 367-373;
S. N. Iyer
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G. Gurujeyalakshmi
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S. N. Giri
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Abstract

This study was undertaken to investigate whether treatment with the antifibrotic drug pirfenidone (PD) down-regulates the bleomycin (BL)-induced overexpression of transforming growth factor (TGF)-β gene in the lungs. Hamsters were intratracheally instilled with SA or BL (6.5 U/kg/4 ml) under anesthesia. They were fed a diet containing 0.5% PD or the same control diet (CD) without the drug 2 days before and throughout the study. After the animals were sacrificed, their lungs were appropriately processed. The BL treatment elevated the total influx of inflammatory cells, including macrophages, by severalfold at different days in bronchoalveolar lavage fluid (BALF) from hamsters in BL + CD groups, relative to the corresponding SA + CD control groups. Treatment with PD significantly (P≤ .05) suppressed the influx of inflammatory cells and macrophages at day 7 in the BL + PD groups, relative to the corresponding BL + CD groups. In addition, the levels of TGF-β in BALF from hamsters in BL + CD groups were elevated by 2.6- to 4.5-fold at different days, relative to the corresponding SA + CD groups. Treatment with PD significantly (P ≤ .05) reduced the TGF-β protein in BALF from BL + PD groups at 14 and 21 days, when compared with the corresponding BL + CD groups. The intratracheal instillation of BL significantly (P ≤ .05) elevated the TGF-β mRNA at 7, 14, and 21 days in BL + CD groups, relative to the corresponding SA + CD groups, and treatment with PD significantly (P ≤ .05) suppressed the TGF-β gene expression in BL + PD groups at these times, when compared with the corresponding BL + CD groups. Nuclear runoff studies revealed that PD suppressed the BL-induced increase in TGF-β gene transcription by 33%. It was concluded that one of the mechanisms for antifibrotic effect of PD is its ability to suppress the BL-induced overexpression of TGF-β gene at the transcriptional level.

Footnotes

  • Send reprint requests to: Dr. Shri N. Giri, Dept. of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616. E-mail:sngiri{at}ucdavis.edu

  • ↵1 This work was supported by National Heart, Lung and Blood Institute Grant R01 HL-56262

  • Abbreviations:
    IPF
    interstitial pulmonary fibrosis
    ECM
    extracellular matrix
    SA
    saline
    IT
    intratracheal
    BL
    bleomycin
    PD
    pirfenidone
    TGF
    transforming growth factor
    IL
    interleukin
    PDGF
    platelet-derived growth factor
    BALF
    bronchoalveolar lavage fluid
    CD
    control diet
    ROS
    reactive oxygen species
    • Received February 19, 1999.
    • Accepted June 21, 1999.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 291 (1)
Journal of Pharmacology and Experimental Therapeutics
Vol. 291, Issue 1
1 Oct 1999
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Research ArticleArticle

Effects of Pirfenidone on Transforming Growth Factor-β Gene Expression at the Transcriptional Level in Bleomycin Hamster Model of Lung Fibrosis

S. N. Iyer, G. Gurujeyalakshmi and S. N. Giri
Journal of Pharmacology and Experimental Therapeutics October 1, 1999, 291 (1) 367-373;

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Research ArticleArticle

Effects of Pirfenidone on Transforming Growth Factor-β Gene Expression at the Transcriptional Level in Bleomycin Hamster Model of Lung Fibrosis

S. N. Iyer, G. Gurujeyalakshmi and S. N. Giri
Journal of Pharmacology and Experimental Therapeutics October 1, 1999, 291 (1) 367-373;
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